CA2628984A1 - Radial shaft seal with large radial offset accommodation - Google Patents

Radial shaft seal with large radial offset accommodation Download PDF

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Publication number
CA2628984A1
CA2628984A1 CA002628984A CA2628984A CA2628984A1 CA 2628984 A1 CA2628984 A1 CA 2628984A1 CA 002628984 A CA002628984 A CA 002628984A CA 2628984 A CA2628984 A CA 2628984A CA 2628984 A1 CA2628984 A1 CA 2628984A1
Authority
CA
Canada
Prior art keywords
seal
axially extending
retainer
insert
annular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002628984A
Other languages
French (fr)
Other versions
CA2628984C (en
Inventor
John C. Dahlheimer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Freudenberg NOK GP
Original Assignee
Freudenberg NOK GP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Freudenberg NOK GP filed Critical Freudenberg NOK GP
Publication of CA2628984A1 publication Critical patent/CA2628984A1/en
Application granted granted Critical
Publication of CA2628984C publication Critical patent/CA2628984C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3224—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip capable of accommodating changes in distances or misalignment between the surfaces, e.g. able to compensate for defaults of eccentricity or angular deviations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/324—Arrangements for lubrication or cooling of the sealing itself
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3268—Mounting of sealing rings
    • F16J15/3276—Mounting of sealing rings with additional static sealing between the sealing, or its casing or support, and the surface on which it is mounted

Abstract

A radial shaft seal is provided for accommodating large radial offset of the shaft relative to a housing. The seal includes an annular retainer insert provided for engaging the seal to a fixed housing. An annular elastomeric seal body is molded to the retainer insert and includes flexible axially extending portion extending from an inner surface of the retainer insert. A seal portion extends axially from a radially inward end of the radially inwardly extending portion and includes a seal lip with a garter spring disposed radially outward of the sealing lip and an elastomeric bearing surface disposed adjacent to the sealing lip. The bearing surface includes a plurality of raised pads adapted to engage the shaft. The pads each include a rounded edge on lateral sides thereof for encouraging the creation of a lubricating film between the pads and shaft. The pads are lubricated by direct exposure to the fluid being sealed.

Claims (25)

1. A radial shaft seal for providing a seal between a fixed housing and a rotating shaft, comprising:

an annular retainer insert;

an annular elastomeric seal body molded to said retainer insert, said seal body including an over-molded portion bonded to said retainer insert, an flexible axially extending portion extending from an inner surface of said retainer insert, and a seal portion extending axially from a radially inward portion of said axially extending portion, said seal portion including a sealing lip with a garter spring disposed radially outward of said sealing lip and an elastomeric bearing portion disposed adjacent to said sealing lip.
2. The radial shaft seal according to claim 1, wherein said annular retainer insert includes a generally L-shaped cross-section with a radially outermost axially extending retainer portion and a radially inwardly extending retainer portion extending from an end of said axially extending retainer portion of said annular retainer insert, said axially extending retainer portion being adapted to be mounted to a housing.
3. The radial shaft seal according to claim 1, wherein said elastomeric bearing portion includes a plurality of raised pads adapted to engage the shaft.
4. The radial shaft seal according to claim 3, wherein said plurality of raised pads each include a rounded edge on lateral sides thereof.
5. The radial shaft seal according to claim 3, wherein said plurality of raised pads have a flat or slightly convex shape which lie tangentially to the shaft and form an acute angle to it.
6. The radial shaft seal according to claim 3, wherein said bearing portion includes a plurality of axially extending grooves disposed between said plurality of raised pads.
7. The radial shaft seal of claim 3 wherein said bearing portion raised pads are exposed directly to, and are lubricated by, the fluid being sealed.
8. The radial shaft seal of claim 5, wherein said sealing lip is lubricated by the fluid being sealed which passes through the axially extending grooves before reaching the sealing lip.
9. The radial shaft seal according to claim 1, wherein said seal portion includes an annular seal insert having an axially extending portion disposed radially outward from said bearing portion.
10. The radial shaft seal according to claim 9, wherein said annular seal insert includes a radially outwardly extending portion extending from said axially extending portion of said annular seal insert.
11. The radial shaft seal according to claim 3, wherein said plurality of pads includes at least 6 pads.
12. The radial shaft seal according to claim 1, wherein said garter spring is disposed on the air side of the seal and is not immersed in, or directly wetted by, the liquid being sealed.
13. The radial shaft seal according to claim 1, wherein the pressure of the liquid being sealed acts radially inward on the exterior surface of said flexible axially extending portion, and acts radially outward on the interior surface of said sealing lip in closest proximity to said elastomeric bearing portion.
14. An assembly comprising:
a housing;

a shaft rotatably mounted relative to said housing; and a radial shaft seal disposed between said housing and said shaft, said radial shaft seal including:

an annular retainer insert; and an annular elastomeric seal body molded to said retainer insert, said seal body including an over-molded portion bonded to said retainer insert, a flexible axially extending portion extending from an inner surface of said retainer insert, and a seal portion extending axially from a radially inward end of said axially extending portion, said seal portion including a sealing lip with a garter spring disposed radially outward of said sealing lip and an elastomeric bearing portion disposed adjacent to said sealing lip and engaged with said shaft and exposed directly to the fluid being sealed and lubricated by this fluid.
15. The assembly according to claim 14, wherein said annular retainer insert includes a generally L-shaped cross-section with a radially outermost axially extending retainer portion and a radially inwardly extending retainer portion extending from an end of said axially extending retainer portion of said annular retainer insert, said axially extending retainer portion being mounted to said housing.
16. The assembly according to claim 14, wherein said elastomeric bearing portion includes a plurality of raised pads engaged with said shaft.
17. The assembly according to claim 16, wherein said plurality of raised pads each include a rounded edge on lateral sides thereof.
18. The radial shaft seal of claim 14, wherein said sealing lip is lubricated by the fluid being sealed which passes through the axially extending grooves before reaching the sealing lip.
19. The assembly according to claim 16, wherein said bearing portion includes a plurality of axially extending grooves disposed between said plurality of raised pads.
20. The assembly according to claim 16 wherein said plurality of raised pads have a flat or slightly convex shape which lie tangentially to the shaft and form an acute angle to it.
21. The assembly according to claim 14, wherein said seal portion includes an annular seal insert having an axially extending portion disposed radially outward from said bearing portion.
22. The assembly according to claim 21, wherein said annular seal insert includes a radially outwardly extending portion extending from said axially extending portion of said annular seal insert.
23. The assembly according to claim 16, wherein said plurality of pads includes at least 6 pads.
24. The assembly according to claim 14, wherein said garter spring is disposed on the air side of the seal and is not immersed in or directly wetted by the liquid being sealed.
25. The assembly according to claim 14, wherein the pressure of the liquid being sealed acts radially inward on the exterior surface of said flexible axially extending portion, and acts radially outward on the interior surface of said sealing lip in closest proximity to said elastomeric bearing portion.
CA2628984A 2007-04-18 2008-04-09 Radial shaft seal with large radial offset accommodation Active CA2628984C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/736,639 2007-04-18
US11/736,639 US7887062B2 (en) 2007-04-18 2007-04-18 Radial shaft seal with large radial offset accommodation

Publications (2)

Publication Number Publication Date
CA2628984A1 true CA2628984A1 (en) 2008-10-18
CA2628984C CA2628984C (en) 2012-06-05

Family

ID=39855412

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2628984A Active CA2628984C (en) 2007-04-18 2008-04-09 Radial shaft seal with large radial offset accommodation

Country Status (4)

Country Link
US (1) US7887062B2 (en)
BR (1) BRPI0801141A2 (en)
CA (1) CA2628984C (en)
MX (1) MX2008005075A (en)

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US8419020B2 (en) * 2004-11-22 2013-04-16 Mide Technology Corporation Fluid activated shaft seal
US7963526B2 (en) * 2007-05-15 2011-06-21 Freudenberg-Nok General Partnership Prelubricated multi-lipped radial shaft seal with large radial offset accommodation
US8590903B2 (en) * 2009-03-24 2013-11-26 Freudenberg-Nok General Partnership Lip seal with inversion prevention feature
US8608172B2 (en) * 2010-04-13 2013-12-17 Mide Technology Corporation Bulkhead seal
US9103446B2 (en) * 2010-09-15 2015-08-11 Aktiebolaget Skf Fluid seal assembly
US9052018B2 (en) 2011-07-11 2015-06-09 Dana Automotive Systems Group, Inc. Eccentricity tolerant valve stem seal assembly
JP5977665B2 (en) * 2012-12-14 2016-08-24 Ｋｙｂ株式会社 Front fork
US9945482B2 (en) * 2014-01-03 2018-04-17 Freudenberg-Nok General Partnership Low load dual flap seal assembly
CN104819297B (en) * 2014-02-04 2017-03-29 Nok株式会社 Oil sealing
US9759330B2 (en) * 2014-02-04 2017-09-12 Freudenberg-Nok General Partnership Energy saving seal with rocking dust lip
CN114857269A (en) * 2014-03-21 2022-08-05 美国圣戈班性能塑料公司 Rotary shaft seal
EP3123063A4 (en) 2014-03-27 2018-03-07 Saint-Gobain Performance Plastics Corporation Rotary shaft housing and seal
CN105782447B (en) * 2014-12-25 2019-06-14 斯凯孚公司 Shaft seal
JP6709722B2 (en) * 2016-11-24 2020-06-17 株式会社ダイヤメット Sintered bearing
DE102017208285B4 (en) * 2017-05-17 2020-08-06 Trelleborg Sealing Solutions Germany Gmbh Sealing ring with 3D printing inlay
US10527173B2 (en) 2017-08-15 2020-01-07 Aktiebolaget Skf Resilient shaft seal
MX2021009915A (en) * 2019-03-12 2021-09-14 Cons Metco Inc Seal case with over-molded rubber gasket securing plastic wafer.
US20230120905A1 (en) * 2021-10-19 2023-04-20 DRiV Automotive Inc. Hydraulic damper with a baffle

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US1733416A (en) * 1925-08-13 1929-10-29 Goodrich Co B F Sealing device for shafts
US1797223A (en) * 1926-12-27 1931-03-24 Goodrich Co B F Rubber bearing or journal for shafts
US2249141A (en) * 1936-04-14 1941-07-15 Nat Oil Seal Co Fluid seal
US2482029A (en) * 1946-08-05 1949-09-13 Noel S Reynolds Seal
US2743950A (en) * 1951-07-12 1956-05-01 Nat Motor Bearing Co Inc Shaft seal
US4000933A (en) * 1975-07-08 1977-01-04 Karl Gustaf Derman Shaft sealing and bearing arrangement, especially for propeller shafts
US4274641A (en) * 1979-10-29 1981-06-23 Garlock Inc. Shaft seal and method
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US7963526B2 (en) * 2007-05-15 2011-06-21 Freudenberg-Nok General Partnership Prelubricated multi-lipped radial shaft seal with large radial offset accommodation

Also Published As

Publication number Publication date
CA2628984C (en) 2012-06-05
MX2008005075A (en) 2009-03-02
US7887062B2 (en) 2011-02-15
BRPI0801141A2 (en) 2008-12-02
US20080258406A1 (en) 2008-10-23

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